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Claude Opus 4.5 vs Kimi K3

Kimi K3 leads Claude Opus 4.5 on coding, 62.3 to 44.0 on the Vibe Coding Index, and Kimi K3 costs 1.7x less per output token ($15.00 vs $25.00 per million). Updated October 21, 2026; 76 benchmarks have a result for both.

Replace Claude Opus 4.5 Replace Kimi K3
Claude Opus 4.5Anthropic
Coding
44.0
Overall
55.7
Output $/M
$25.00
2
Kimi K3Moonshot AI
Coding
62.3
Overall
66.5
Output $/M
$15.00
74
vs boards won of 76 shared

Claude Opus 4.5 or Kimi K3: which to pick

Pick Kimi K3 for coding: it scores 62.3 on the Vibe Coding Index against 44.0 for Claude Opus 4.5.

Pick Claude Opus 4.5 for work measured by SimpleBench or MortgageTax (Vals AI), where it leads.

Model AClaude Opus 4.5Anthropic44.0/1003 independent benchmarks$1.37 per solved taskModel BKimi K3Moonshot AI62.3/1006 independent benchmarks$0.81 per solved task
Shared results
76
Claude Opus 4.5 only
32
Kimi K3 only
41
Like-for-like categories
8 of 9

Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.

Which one for your work

Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.

At a glance

Coding index
Claude Opus 4.5 44.0 from 3 benchmarks, Kimi K3 62.3 from 6 benchmarks.
Widest category
Math, 24.2 points apart on average over 6 shared benchmarks.
Widest single gap
Vibe Code Bench (Vals AI): Claude Opus 4.5 20.6% against Kimi K3 85.0%, 64.3 points apart on a 0 to 100 scale.
Output price
Claude Opus 4.5 $25.00 against Kimi K3 $15.00 per million output tokens, 1.7x apart.
Context window
Claude Opus 4.5 takes 200K tokens, Kimi K3 1.05M.

Benchmark by benchmark

First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.

Boards won, where both have a result
CategoryClaude Opus 4.5BarsKimi K3Ties
Coding09
Intelligence02
Agentic work05
Reasoning112
Math06
Knowledge110
Web design07
General023
All shared boards274
CodingLike-for-likeSix of these boards feed the Vibe Coding Index09
Coding benchmarks for Claude Opus 4.5 and Kimi K3
BenchmarkClaude Opus 4.5Kimi K3Leader
SWE-bench Verified79.2%Not measuredOnly Claude Opus 4.5 measured
SWE-bench (full test set)52.6%Not measuredOnly Claude Opus 4.5 measured
SWE-bench Multilingual70.7%Not measuredOnly Claude Opus 4.5 measured
LiveBench codingNot measured59.3%Only Kimi K3 measured
LMArena WebDev14941655Kimi K3
AA Coding IndexNot measured76.2Only Kimi K3 measured
LiveCodeBench (Vals AI)83.7%87.2%Kimi K3
SWE-bench Verified (Vals AI)76.4%93.4%Kimi K3
Terminal-Bench 4 (Vals AI)Not measured17.2%Only Kimi K3 measured
Vibe Code Bench (Vals AI)20.6%85.0%Kimi K3
Code migration (Vals AI)Not measured16.1%Only Kimi K3 measured
ProgramBench (Vals AI)Not measured2.0%Only Kimi K3 measured
IOI (Vals AI)Not measured48.9%Only Kimi K3 measured
Terminal-Bench 2.1 (Vals AI)Not measured80.9%Only Kimi K3 measured
SWE-bench Multimodal (Vals AI)Not measured44.2%Only Kimi K3 measured
Vibe Code Bench 1-100 (Vals AI)Not measured18.2%Only Kimi K3 measured
CyberBench (Vals AI)Not measured75.2%Only Kimi K3 measured
LiveCodeBench (Artificial Analysis run)87.1%Not measuredOnly Claude Opus 4.5 measured
SciCodeNot measured59.5%Only Kimi K3 measured
Terminal-Bench Hard (Artificial Analysis run)47.0%Not measuredOnly Claude Opus 4.5 measured
Terminal-Bench63.1%Not measuredOnly Claude Opus 4.5 measured
FrontierCodeNot measured44.2%Only Kimi K3 measured
FrontierSWENot measured25.9%Only Kimi K3 measured
GSO-Bench26.5%Not measuredOnly Claude Opus 4.5 measured
WeirdML63.7%82.6%Kimi K3
Cybench82.0%Not measuredOnly Claude Opus 4.5 measured
ALE-BenchNot measured1524.5Only Kimi K3 measured
LMArena Text: coding15031508Kimi K3
LMArena Text: software and IT14831499Kimi K3
LMArena WebDev: React14781670Kimi K3
LMArena WebDev: HTML15101644Kimi K3
LMArena WebDev: from an imageNot measured1579Only Kimi K3 measured
Neither model has a result on the other 7 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for Claude Opus 4.5 and Kimi K3
BenchmarkClaude Opus 4.5Kimi K3Leader
AA Intelligence Index29.143.6Kimi K3
Epoch Capabilities Index150.1157.9Kimi K3
Agentic workLike-for-likePublic boards, shown as published, kept out of the index05
Agentic work benchmarks for Claude Opus 4.5 and Kimi K3
BenchmarkClaude Opus 4.5Kimi K3Leader
AA Agentic IndexNot measured50.0Only Kimi K3 measured
Design Arena: agents building web apps11591295Kimi K3
Design Arena: agents building full-stack apps11561315Kimi K3
Design Arena: agents building mobile apps11891269Kimi K3
Design Arena: agents building Android apps11751250Kimi K3
Design Arena: agents building Godot gamesNot measured1223Only Kimi K3 measured
Design Arena: agents building gamesNot measured1252Only Kimi K3 measured
Design Arena: HTML slidesNot measured1256Only Kimi K3 measured
Design Arena: PowerPoint slidesNot measured1273Only Kimi K3 measured
Design Arena: spreadsheetsNot measured1058Only Kimi K3 measured
LiveBench researchNot measured79.0%Only Kimi K3 measured
LiveBench browserNot measured16.0%Only Kimi K3 measured
LiveBench long agenticNot measured42.8%Only Kimi K3 measured
Finance Agent (Vals AI)Not measured53.1%Only Kimi K3 measured
Tax Agent Bench (Vals AI)Not measured33.4%Only Kimi K3 measured
Legal Research Bench (Vals AI)Not measured46.1%Only Kimi K3 measured
Harvey's Legal Agent Benchmark (Vals AI)Not measured12.9%Only Kimi K3 measured
Excel Modeling Benchmark (Vals AI)Not measured66.7%Only Kimi K3 measured
BioMysteryBench (Vals AI)Not measured72.6%Only Kimi K3 measured
Terminal-Bench-Science (Vals AI)Not measured1.4%Only Kimi K3 measured
Time Horizon Index (Vals AI)Not measured10.5%Only Kimi K3 measured
τ²-Bench Telecom89.5%Not measuredOnly Claude Opus 4.5 measured
APEX-AgentsNot measured47.8%Only Kimi K3 measured
METR time horizons75.0%Not measuredOnly Claude Opus 4.5 measured
Remote Labor Index3.8%Not measuredOnly Claude Opus 4.5 measured
GDPval45.5%Not measuredOnly Claude Opus 4.5 measured
BALROG43.5%Not measuredOnly Claude Opus 4.5 measured
DeepResearch Bench54.8%Not measuredOnly Claude Opus 4.5 measured
PostTrainBenchNot measured32.0%Only Kimi K3 measured
OSWorld66.3%Not measuredOnly Claude Opus 4.5 measured
Vending-Bench 2$4,967$5,165Kimi K3
Berkeley Function Calling Leaderboard (BFCL)77.5%Not measuredOnly Claude Opus 4.5 measured
Neither model has a result on the other 9 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index112
Reasoning benchmarks for Claude Opus 4.5 and Kimi K3
BenchmarkClaude Opus 4.5Kimi K3Leader
GPQA Diamond85.9%92.9%Kimi K3
LiveBench reasoningNot measured90.7%Only Kimi K3 measured
MMMU Pro (Vals AI)83.0%88.2%Kimi K3
GPQA Diamond (Artificial Analysis run)86.6%93.5%Kimi K3
Humanity's Last Exam (Artificial Analysis run)30.1%46.9%Kimi K3
GPQA Diamond (Epoch AI run)86.0%93.1%Kimi K3
ARC-AGI80.0%94.5%Kimi K3
ARC-AGI-237.6%60.4%Kimi K3
SimpleBench62.0%60.7%Claude Opus 4.5
Chess puzzles14.0%37.0%Kimi K3
Mystery game puzzles22.0%26.0%Kimi K3
EBR-bench14.3%Not measuredOnly Claude Opus 4.5 measured
VPCT40.0%Not measuredOnly Claude Opus 4.5 measured
LMArena Text: hard prompts14761495Kimi K3
LMArena Text: expert14871520Kimi K3
LMArena Text: hard prompts in English14821496Kimi K3
Kagi LLM Benchmark80.2%Not measuredOnly Claude Opus 4.5 measured
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index06
Math benchmarks for Claude Opus 4.5 and Kimi K3
BenchmarkClaude Opus 4.5Kimi K3Leader
AIME95.4%Not measuredOnly Claude Opus 4.5 measured
MGSM (Vals AI)95.2%Not measuredOnly Claude Opus 4.5 measured
AA Math Index91.3Not measuredOnly Claude Opus 4.5 measured
AIME 2025 (Artificial Analysis run)91.3%Not measuredOnly Claude Opus 4.5 measured
OTIS Mock AIME86.1%97.2%Kimi K3
FrontierMath, tiers 1 to 334.4%72.2%Kimi K3
FrontierMath, tier 44.9%39.0%Kimi K3
ProofBench36.0%87.0%Kimi K3
LMArena Text: math14631494Kimi K3
LMArena Text: mathematical work14681505Kimi K3
Neither model has a result on the other 3 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index110
Knowledge benchmarks for Claude Opus 4.5 and Kimi K3
BenchmarkClaude Opus 4.5Kimi K3Leader
MMLU Pro87.3%88.0%Kimi K3
LegalBench (Vals AI)84.6%86.2%Kimi K3
CaseLaw (Vals AI)62.6%Not measuredOnly Claude Opus 4.5 measured
CorpFin (Vals AI)65.1%71.6%Kimi K3
TaxEval (Vals AI)74.9%75.7%Kimi K3
MortgageTax (Vals AI)68.7%66.3%Claude Opus 4.5
MedQA (Vals AI)95.9%Not measuredOnly Claude Opus 4.5 measured
MedCode (Vals AI)49.2%49.4%Kimi K3
MMLU Pro (Artificial Analysis run)89.5%Not measuredOnly Claude Opus 4.5 measured
SimpleQA Verified45.7%50.6%Kimi K3
GeoBench75.0%Not measuredOnly Claude Opus 4.5 measured
LMArena Text: science14541508Kimi K3
LMArena Text: medicine and healthcare14441489Kimi K3
LMArena Text: legal and government14591503Kimi K3
LMArena Text: business and finance14481470Kimi K3
FACTS Benchmark Suite43.9%Not measuredOnly Claude Opus 4.5 measured
Neither model has a result on the other 2 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index07
Web design benchmarks for Claude Opus 4.5 and Kimi K3
BenchmarkClaude Opus 4.5Kimi K3Leader
Design Arena: websites12471335Kimi K3
Design Arena: UI components12381344Kimi K3
Design Arena: game dev12291359Kimi K3
Design Arena: data viz12431351Kimi K3
Design Arena: 3D12141388Kimi K3
Design Arena: all code categories12421360Kimi K3
Design Arena: SVG11811302Kimi K3
Design Arena: ASCII art1190Not measuredOnly Claude Opus 4.5 measured
LiveBench designNot measured77.2%Only Kimi K3 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index023
General benchmarks for Claude Opus 4.5 and Kimi K3
BenchmarkClaude Opus 4.5Kimi K3Leader
Vals IndexNot measured53.0%Only Kimi K3 measured
LiveBench data analysisNot measured78.7%Only Kimi K3 measured
Public Benefits Bench (Vals AI)Not measured68.2%Only Kimi K3 measured
SAGE (Vals AI)52.1%52.8%Kimi K3
MedScribe (Vals AI)85.3%88.0%Kimi K3
Vals Multimodal IndexNot measured73.4%Only Kimi K3 measured
IFBench58.0%Not measuredOnly Claude Opus 4.5 measured
Long context reasoning (AA-LCR)77.3%88.7%Kimi K3
DTBench89.9%91.2%Kimi K3
LMCA44.5%52.7%Kimi K3
CL-bench21.1%Not measuredOnly Claude Opus 4.5 measured
Surface Evolver BenchNot measured95.0%Only Kimi K3 measured
Furniture assembly28.3%34.2%Kimi K3
LMArena Text14511476Kimi K3
LMArena Text: instruction following14781485Kimi K3
LMArena Text: creative writing14451457Kimi K3
LMArena Text: English14611481Kimi K3
LMArena Text: non-English14381466Kimi K3
LMArena Text: Chinese14701529Kimi K3
LMArena Text: German14491490Kimi K3
LMArena Text: Japanese14171494Kimi K3
LMArena Text: Korean14241460Kimi K3
LMArena Text: French14711492Kimi K3
LMArena Text: Spanish14571472Kimi K3
LMArena Text: Russian14471485Kimi K3
LMArena Text: Polish14391458Kimi K3
LMArena Text: multi-turn14661489Kimi K3
LMArena Text: longer queries14791494Kimi K3
LMArena Text: writing and language14521471Kimi K3
LMArena Text: entertainment and media14341453Kimi K3
LMArena Document1462Not measuredOnly Claude Opus 4.5 measured
Neither model has a result on the other 15 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Opus 4.5 and Kimi K3
BenchmarkClaude Opus 4.5Kimi K3Leader
Neither model has a result on 5 boards here

What each workload costs

Three fixed token mixes at each model's listed price, so per-token rates become a bill.

Chat turn

1K input + 500 output tokens

Claude Opus 4.5$0.018Fits in one request
Kimi K3$0.011Fits in one request

Kimi K3 costs less

Repository review

50K input + 3K output tokens

Claude Opus 4.5$0.325Fits in one request
Kimi K3$0.195Fits in one request

Kimi K3 costs less

Agent loop

200K input + 10K output tokens

Claude Opus 4.5$1.25Exceeds the context window
Kimi K3$0.750Fits in one request

Kimi K3 costs less

Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.

Specification differences

The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.

Specifications of Claude Opus 4.5 and Kimi K3
SpecificationAnthropic Claude Opus 4.5MoonshotAI Kimi K3
MakerAnthropicMoonshot AI
WeightsNo public weights listedOpen weights
ReleasedNovember 24, 2025July 16, 2026
Context window200K1.05M
Input $/Mtok$5.00$3.00
Output $/Mtok$25.00$15.00
Coding index44.062.3
Independent measurements behind it36
Cost per solved task$1.37$0.81
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 4.5 better than Kimi K3 for coding?

Pick Kimi K3 for coding: it scores 62.3 on the Vibe Coding Index against 44.0 for Claude Opus 4.5. Pick Claude Opus 4.5 for work measured by SimpleBench or MortgageTax (Vals AI), where it leads.

Which is cheaper, Claude Opus 4.5 or Kimi K3?

Claude Opus 4.5 costs $5.00 per million input tokens and $25.00 per million output tokens; Kimi K3 costs $3.00 and $15.00. Per solved SWE-bench Verified task, Claude Opus 4.5 costs $1.37 and Kimi K3 $0.81.

Which has the bigger context window, Claude Opus 4.5 or Kimi K3?

Kimi K3, with 1.05M tokens against 200K.

How many benchmarks is the Claude Opus 4.5 vs Kimi K3 comparison based on?

76 benchmarks have a result for both models as of October 21, 2026. Claude Opus 4.5's coding index rests on 3 independent benchmarks and Kimi K3's on 6. Where only one model has a result, the page says so instead of naming a winner.

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